JP4031222B2 - Scroll type fluid machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scroll fluid machine suitable for a compressor or a vacuum pump used in, for example, a nitrogen concentrator or a medical oxygen concentrator.
[0002]
[Prior art]
In order to concentrate gases such as nitrogen and oxygen contained in air at room temperature, a membrane separation method, a PSA method using an adsorbent, and a method using an oxygen adsorbent (CMS) are generally employed. ing.
[0003]
Membrane separation system and, at the same time air taken from the atmosphere pressurized by the compressor is fed to the hollow fiber membrane, a vacuum pump provided on the outlet side or the middle of the hollow fiber membrane, is a hollow fiber membrane such that vacuum Yes.
[0004]
To concentrate oxygen using a nitrogen adsorbent (for example, zeolite) by the PSA method using an adsorbent, the air taken from the atmosphere is pressurized with a compressor and sent to the adsorption tower, and passes through the adsorption tower. Nitrogen is adsorbed to the air inside, and oxygen-enriched air is discharged from the outlet of the adsorption tower. When nitrogen is no longer adsorbed in the adsorption tower, the passage between the upstream of the adsorption tower and the compression is closed, the downstream is connected to a vacuum pump, and the inside of the adsorption tower is depressurized by the vacuum pump to be adsorbed. Nitrogen is desorbed and reduced to the air as exhaust gas.
[0005]
Furthermore, in order to perform oxygen concentration using oxygen adsorbent (CMS), air taken from the atmosphere is pressurized with a compressor and sent into the adsorption tower to adsorb oxygen to the air passing through the adsorption tower. Let From the outlet of the adsorption tower, air from which oxygen has been removed is discharged and reduced as exhaust gas into the air.
[0006]
Next, when oxygen is no longer adsorbed in the adsorption tower, the passage between the upstream of the adsorption tower and the compressor is closed, the downstream is connected to a vacuum pump, and the inside of the adsorption tower is depressurized by the vacuum pump. Oxygen that is present is desorbed and oxygen-enriched air is discharged.
[0007]
In any of the systems described above, a compressor and a vacuum pump are required.
[0008]
[Problems to be solved by the invention]
According to the above-described conventional technology, since the compressor and the vacuum pump, which are separate bodies, are provided, a large space is required to install them, and it is difficult to implement in a narrow place and is inconvenient to transport. However, there are problems such as an increase in transportation cost.
[0009]
SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional technology, the present invention has a scroll fluid machine that has both functions of a compressor and a vacuum pump, enables use in a narrow space, and facilitates conveyance. The purpose is to provide.
[0010]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
A fixed scroll in which a spiral fixed wrap is erected on one side surface, and a spiral that is pivotally provided on the drive shaft and forms a sealed chamber with the fixed wrap on one side surface facing the fixed scroll. In the scroll type fluid machine including the orbiting scroll in which a circular orbiting wrap is erected, the sealed chamber is formed on the outer side with an annular partition provided on one side surface of the fixed scroll or one side surface of the orbiting scroll. It is defined as an inner peripheral side sealed chamber formed on the inner side in the same manner as the outer peripheral side sealed chamber, and the outer peripheral side suction port is sucked from the outer peripheral side suction port to the inner peripheral side. provided gaseous outer circumferential side discharge port for discharging by compressing the respective further inner peripheral side suction port on the outer peripheral side of the inner peripheral side sealing chamber, the same center side, suction from the inner circumferential side inlet An inner peripheral side discharge port for discharging by compressing the gaseous, provided with respectively, the outer circumferential side discharge port to the external device requires a compressed gas, also the inner circumferential side inlet, require vacuum By connecting them to external devices, the outer peripheral side sealed chamber functions as a compressor and the inner peripheral side sealed chamber functions as a vacuum pump .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal side view of a scroll type fluid machine, and FIG. 2 is a longitudinal sectional view taken along line II-II in FIG.
[0012]
(1) is a fixed scroll, on the front surface (right side in FIG. 1) of a fixed end plate (3) integral with the housing (2), an annular partition wall (4 ) Inside the annular partition wall (4), a spiral inner peripheral fixed wrap (5) from the center side toward the outer periphery side, and an outer periphery side from the predetermined position outside the annular partition wall (4) toward the outer periphery side. A fixed wrap (6) is erected. (7) is a tip seal that is provided on the front end surfaces of the fixed wraps (5), (6) and the partition wall (4) and that is in sliding contact with the front surface of the later-described turning end plate (10).
[0013]
(8) is a orbiting scroll arranged to face the front surface of the fixed scroll (1), and faces the front surface of the circular orbiting end plate (10) provided in the housing (9), that is, the fixed scroll (1). In the radial direction, away from the spiral inner swirl wrap (11) and the inner swirl wrap (11) from the center side to the outer peripheral side, almost to the center in the radial direction. A spiral outer swirl wrap (12) is provided upright from approximately the center to the outermost periphery.
[0014]
(13) is a tip seal provided on the front end surface of each of the swirl wraps (11) and (12) and in sliding contact with the front surface of the fixed end plate (3).
[0015]
At the center of the rear surface of the bearing plate (14) fixed to the rear side of the orbiting scroll (8), that is, the surface opposite to the orbiting laps (11) and (12), the eccentric shaft portion of the drive shaft (15) is provided. A cylindrical boss (18) for pivotally supporting (16) via a bearing (17) is projected, and three known crankpin type anti-rotation mechanisms (19), for example, are incorporated at appropriate positions on the outer periphery. The orbiting scroll (8) can be eccentrically orbited with respect to the housing (9).
[0016]
The fixed scroll (1) and the orbiting scroll (8) correspond to the eccentric amount of the eccentric shaft portion (16) with respect to the center of the orbiting scroll (8) and the center of the fixed scroll (1) and the drive shaft (15). The inner scroll wrap (11) of the orbiting scroll (8) is set to the inner peripheral lock wrap (5) of the fixed scroll (1) and the outer swivel wrap (12) is outer peripheral. The side fixing wraps (6) are arranged so as to mesh with each other.
[0017]
Thereby, the sealed chamber formed between the fixed scroll (1) and the orbiting scroll (8) has the annular partition wall (4), and is formed on the inner side in the same manner as the outer peripheral side sealed chamber (A) formed on the outer side. The inner circumferential side closed chamber (B) is defined so that the gas flow path is blocked.
[0018]
The pressing plate (20) is brought into contact with the rear surface of the fixed scroll (1) and tightened with an appropriate tightening screw (21), and the front surface of the bearing plate (14) is brought into contact with the rear surface of the orbiting scroll (8). The scroll type fluid machine can be assembled by fastening both of them together with a fastening screw (22) or the like and integrating them.
[0019]
The drive shaft (15) is connected to a motor (not shown) provided outside the housing (9) via a pulley and a V-belt or the like, or a motor (not shown) provided in the housing (9). Directly connected to the rotating shaft and rotated in a predetermined direction by a motor.
[0020]
On the outermost periphery of the outer peripheral side fixed wrap (6), an outer peripheral side suction port (23) for taking in the atmosphere into the outer peripheral side sealed chamber (A) is formed.
[0021]
The fixed scroll (1) includes an outer peripheral side discharge port (24) that penetrates the fixed end plate (3) in the axial direction in the vicinity of the outer peripheral side of the annular partition wall (4) and communicates with the outer peripheral side sealed chamber (A). In the vicinity of the inner peripheral side of the annular partition wall (4), the inner peripheral side suction port (25) leading to the inner peripheral side sealed chamber (B) and the inner peripheral side sealed chamber (B) substantially at the center of the fixed scroll (1). An inner peripheral discharge port (26) is provided.
[0022]
The outer peripheral discharge port (24) is connected via a conduit (27) to an external device (28) that requires compressed gas. The inner peripheral suction port (25) is connected to an external device (30) that requires a vacuum via a conduit (29). The air sucked from the external device (30) through the conduit (29) and flowing into the inner peripheral side sealed chamber (B) is discharged to the outside through the inner peripheral side discharge port (26).
[0023]
When the orbiting scroll (8) is rotated by the motor, in the outer peripheral side sealed chamber (A), the air that has entered from the outer peripheral suction port (23) is allowed to flow into the outer peripheral side fixed wrap (6) and the outer peripheral side rotating wrap (12 ) Compressed air from the outer peripheral discharge port (24) and finally compressed air from the outer peripheral side discharge port (24) while being sequentially compressed by the compression chamber formed between the external chamber (28) To send. That is, the outer peripheral side sealed chamber (A) functions as a compressor.
[0024]
At the same time, in the inner peripheral side sealed chamber (B), the air in the external device (30) that requires vacuum sucked from the inner peripheral side suction port (25) is transferred to the inner peripheral side fixed wrap (5). and while the inner circumferential side are sequentially compressed by the orbiting wrap (11) compression chamber formed between, it is moved toward the center side, by discharging from the inner circumferential side discharge port (26) to the outside, requiring a vacuum Reduce the pressure inside the external device (30) to be in a vacuum state. That is, the inner peripheral side sealed chamber (B) functions as a vacuum pump.
[0025]
In the above-described embodiment, the annular partition wall (4) is provided on the fixed scroll (1) side. Alternatively, the annular partition wall (4) may be provided on the orbiting scroll (8) side.
[0026]
【The invention's effect】
According to the present invention as described above, a sealed chamber formed between the fixed scroll and the orbiting scroll, by a simple configuration in which only defines on the outer peripheral side sealing chamber and the inner peripheral side sealed chamber by an annular partition wall, a single The scroll-type fluid machine can be given both functions as a compressor and a vacuum pump, so that the cost can be reduced, and it can be used in a narrow space and can be easily transported. Can do.
[0027]
Conventionally, for example, when a compressor and a vacuum pump are used as a medical oxygen concentrator, the equipment has been enlarged and difficult to carry. However, the present invention can reduce the size and weight. It becomes possible and can be carried easily.
[0028]
Further, by connecting the outer peripheral side discharge port of the scroll type fluid machine of the present invention to the inlet side of the adsorption tower and the inner peripheral side suction port to the outlet side of the adsorption tower, without providing a compressor and a vacuum pump, with one scroll fluid machine of the same drive source, it is possible to obtain an oxygen-enriched air.
[0029]
Furthermore, the inner peripheral side sealing chamber vacuum pump, by function, it is possible to suppress the temperature rise in the central portion of the scroll fluid machine, the life improvement of the grease and the bearing of the rotary bearing portion disposed at the center Can be planned.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a scroll fluid machine according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view taken along line II-II in FIG.
[Explanation of symbols]
(1) Fixed scroll
(2) Housing
(3) Fixed end plate
(4) Annular partition
(5) Inner peripheral side fixed wrap
(6) Outer peripheral side fixed wrap
(7) Tip seal
(8) Orbiting scroll
(9) Housing
(10) Revolving end plate
(11) Inner circumference turning lap
(12) Outer periphery side wrap
(13) Tip seal
(14) Bearing plate
(15) Drive shaft
(16) Eccentric shaft
(17) Bearing
(18) Cylindrical boss
(19) Anti-rotation mechanism
(20) Press plate
(21) (22) Clamping screw
(23) Outer side suction port
(24) Outer side discharge port
(25) Inner circumference suction port
(26) Inner discharge port
(27) Conduit
(28) External equipment that requires compressed gas
(29) Conduit
(30) External equipment that requires vacuum
(A) Outer peripheral side sealed chamber
(B) Inner side sealed chamber

Claims (1)

A fixed scroll in which a spiral fixed wrap is erected on one side surface, and a spiral that is pivotally provided on the drive shaft and forms a sealed chamber with the fixed wrap on one side surface facing the fixed scroll. A scroll type fluid machine including a orbiting scroll provided with a circular orbiting wrap,
The sealed chamber has an annular partition provided on one side surface of the fixed scroll or one side surface of the orbiting scroll , and is defined as an outer peripheral side sealed chamber formed on the outer side and an inner peripheral side sealed chamber formed on the inner side. An outer peripheral side suction port on the outer peripheral side in the outer peripheral side sealed chamber, and an outer peripheral side discharge port for compressing and discharging the gas sucked from the outer peripheral side suction port on the inner peripheral side, respectively, the inner peripheral side suction port on the outer peripheral side of the peripheral side sealed chamber, the same center side, the inner side discharge port for discharging by compressing the gas sucked from the inner circumferential side inlet, provided with respective outer peripheral By connecting the side discharge port to an external device that requires compressed gas, and the inner peripheral side suction port to an external device that requires vacuum, the outer peripheral side sealed chamber is connected to the compressor, A vacuum pump is used for the inner chamber Scroll fluid machine being characterized in that so as to respectively function as a.

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